kk Blog —— 通用基础

function rad($d)
{
	return $d * 3.1415926535898 / 180.0;
}

function GetDistance($lat1, $lng1, $lat2, $lng2)
{
	$EARTH_RADIUS = 6378.137;

	$radLat1 = $this->rad($lat1);
	$radLat2 = $this->rad($lat2);
	$a = $radLat1 - $radLat2;

	$b = $this->rad($lng1) - $this->rad($lng2);

	$s = 2 * asin(sqrt(pow(sin($a/2),2) + cos($radLat1)*cos($radLat2)*pow(sin($b/2),2)));
	$s = $s *$EARTH_RADIUS;
	$s = round($s * 1000);
	return $s;
}

GetDistance(26.000000, 118.000000, 25.000000, 117.000000);